Which describes that the left hemisphere controls the right side of the body and the right hemisphere controls the left?

Which describes that the left hemisphere controls the right side of the body and the right hemisphere controls the left?

• A. Ipsilateral Control
• B. Nervous System
• C. Contralateral Control
• D. Hemispheric Specialization

Answer: (C)

The concept here is contralateral control: each hemisphere of the brain largely controls the opposite side of the body. This happens because the main motor and sensory pathways cross over to the other side as they descend from the brain or ascend to it. For movement, the primary motor cortex sends commands down the corticospinal tract, and these fibers cross at the medullary pyramids, so the left hemisphere ends up steering the right side and the right hemisphere the left. This crossing explains why a lesion in the left hemisphere can produce weakness or paralysis on the right side, and vice versa. The other options don’t capture this cross-hemisphere wiring: ipsilateral control would mean same-side control, which isn’t how these pathways are organized; the nervous system is too broad a label for this specific pattern; hemispheric specialization refers to different functions being dominant in each hemisphere, not to which side of the body they control.

The concept here is contralateral control: each hemisphere of the brain largely controls the opposite side of the body. This happens because the main motor and sensory pathways cross over to the other side as they descend from the brain or ascend to it. For movement, the primary motor cortex sends commands down the corticospinal tract, and these fibers cross at the medullary pyramids, so the left hemisphere ends up steering the right side and the right hemisphere the left. This crossing explains why a lesion in the left hemisphere can produce weakness or paralysis on the right side, and vice versa. The other options don’t capture this cross-hemisphere wiring: ipsilateral control would mean same-side control, which isn’t how these pathways are organized; the nervous system is too broad a label for this specific pattern; hemispheric specialization refers to different functions being dominant in each hemisphere, not to which side of the body they control.